Wireless Radar Interference Cancellation Using Adaptive Leakage Filtering
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Solution Overview
Problem
Conventional wireless devices face interference issues due to non-isolated transmit and receive chains, which affect radar detection accuracy by causing signal leakage and ambient reflections, reducing the efficacy of presence detection and radar operations.
Innovation Solution
Implement adaptive filters for interference cancellation, calibrated through a training phase to mitigate over-the-air and on-chip leakage, as well as ambient reflections, using techniques like Least Mean Squared and Recursive Least Squared methods, in both time and frequency domains.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If transmit and receive chains are used in wireless devices, then wireless communication and radar operations are enabled, but interference from transmitted signals affects received signals due to non-isolated chains
Solution Approach 1:
The patent extracts and removes the interference component from the received signal through adaptive filtering. The adaptive filter specifically targets and removes transmit signal leakage and ambient reflections from the receive chain output, separating the harmful interference from the useful reflected signals for radar detection
Solution Approach 2:
The patent introduces an adaptive filter as an intermediary component between the receive chain and the radar processing system. This intermediary processes the received signal by dynamically adjusting filter coefficients to cancel interference while preserving the reflected signals of interest
2Measurement precision
If adaptive filters are used for interference cancellation, then radar detection accuracy is improved, but device complexity increases due to calibration and processing requirements
Solution Approach 1:
The patent performs preliminary calibration of the adaptive filter coefficients during a training phase before actual radar detection. This preliminary action establishes the filter's ability to recognize and cancel interference patterns, so that during operational phase the filter can effectively improve detection accuracy without real-time complexity
Solution Approach 2:
The patent implements feedback mechanisms where the adaptive filter continuously monitors the received signal and adjusts its coefficients based on the detected interference patterns. This feedback loop enables the system to dynamically optimize interference cancellation while maintaining detection accuracy
Data Source
AI summary
Systems, methods, and devices perform interference cancellation operations for wireless devices. Methods may include transmitting an input signal using a transmitter of a transceiver included in a wireless device, and receiving an interference signal at a receiver of the transceiver, wherein the interference signal includes one or more of an over-the-air leakage signal and a reflected signal. Methods may also include performing interference cancellation operations on the interference signal based, at least in part, on one or more adjustments to the receiver determined based on the input signal and the received interference signal, and generating, using the transceiver, an output signal based, at least in part, on the interference cancellation operations.